course washout in relation to autopilot
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Join Date: Aug 1998
Location: australia
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course washout in relation to autopilot
Dear all,
What does the term course washout mean in regards to an autopilot?? ps I have looked in ac electric books for the explanantion!
thank you. dw.
What does the term course washout mean in regards to an autopilot?? ps I have looked in ac electric books for the explanantion!
thank you. dw.
Join Date: Mar 2006
Location: Choroni, sometimes
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Hi,
course washout function on AP/FD is used to follow LOC in x-wind.
e.g. over a period of time (100s ?) the AP/FD takes the new heading as datum and if the course error is zero, it's washed out. You can proof it if you follow the LOC on a beautifull day and turn the ILS course in the CDI for some degree! The deviation remains (zero I hope
) but nevertheless your AP/FD will interpret it as a wind change, starts turning but will come back.
DON'T DO IT FOR AUTOLAND.
That's a different story.
regards
course washout function on AP/FD is used to follow LOC in x-wind.
e.g. over a period of time (100s ?) the AP/FD takes the new heading as datum and if the course error is zero, it's washed out. You can proof it if you follow the LOC on a beautifull day and turn the ILS course in the CDI for some degree! The deviation remains (zero I hope
) but nevertheless your AP/FD will interpret it as a wind change, starts turning but will come back.DON'T DO IT FOR AUTOLAND.
That's a different story.
regards
try this link which also covers the subject
http://www.pprune.org/tech-log/35204...737-800-a.html
http://www.pprune.org/tech-log/35204...737-800-a.html
